Meh. I'd do 3 days CNX and 3 days HKG with a side trip to Macau or Shenzen.
Any Hawaiian island beats HKT.
So you say skip HKT altogether?
So three votes HKG vs one vote CNX.
I think that's plenty of time for CNX. I was there for Thu/Fri/Shabbos and did most of the typical CNX activities discussed here.
There are two things I would have done with more time: (1) A "real" hill tribe tour. Meaning seeing authentic life in the tribes, not a show for the tourists. But some people claim this takes at least 2-3 days to do right as you need to go far out with a proper guide. (2) A full day scooter/motorbike trip. I did a more modest half-day trip into the mountains (which I recommend), but would have loved to go further out - there is some spectacular scenery (you can google routes).
For snorkeling, I think you would do better in the Caribbean.
Great, thanks for the ideas.
Did you write a TR of your trip to CNX?
2015: 116K bkd | 1.6M brnd | F: OZ,NH,AA,EK | J: UA,CA,TK,DL,TN,AF,VA | LIH,NRT,ROR,PEK,CNS,BOB,MEL,TLV & Pacific Hopper